US3609732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas responsive switching device
Assignee: New Cosmos Electric Co Ltd
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Filing: 1970-05-21
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Granted: 1971-09-28
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Expires: 1990-05-21
Abstract
Abstract A gas responsive switching device for detecting gas concentrations in air which uses a heated semiconductor having two electrodes embedded therein, a resistor connected in series with the electrodes and across a power source, a thyristor and relay coil connected in series across a source of power and a connection between the control electrode and a tap on said resistor. The device may also include a second relay having a coil connected in series with said voltage divider and adjusted so that both relays operate at two different gas concentrations.
Inventors
- 👤 Riichiro Kasahara
- 👤 Yuichi Shimakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/122; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A gas responsive device comprising an inflammable gas detecting element having two electrodes at least one of which is a heating electrode and a metal oxide semiconductor enclosing and contacting both electrodes, said semiconductor having a resistance variable in response to the concentration of said gas in air, a first power source connected to said heating electrode for heating the said semiconductor, a second power source, a voltage divider including a tap thereon, a connection from one of said electrodes to one side of the second power source, means including said voltage divider connecting the other of said electrodes to the other side of said second power source, a relay having a coil and contacts operated by said coil, a thyristor having a control electrode, said relay coil and thyristor being connected in series across said second power source and a connection between said control electrode and the tap on said voltage divider.
Claim 2
Dependent Claim
153 words
A gas responsive device comprising an inflammable gas detecting element having two electrodes at least one of which is a heating electrode and a metal oxide semiconductor enclosing and contacting both electrodes, said semiconductor having a resistance variable in response to the concentration of said gas in air, a first power source connected to said heating electrode for heating the said semiconductor, a second power source, a voltage divider including a tap thereon, a connection from one of said electrodes to one side of the second power source, means including said voltage divider connecting the other of said electrodes to the other side of said second power source, a relay having a coil and contacts operated by said coil, a thyristor having a control electrode, said relay coil and thyristor being connected in series across said second power source and a connection between said control electrode and the tap on said voltage divider.
Claim 3
Dependent Claim
34 words
A gas responsive device according to claim 1 wherein said other electrode is a heating electrode and said device includes a third power source cOnnected to said other electrode whereby both electrodes are heated.
Claim 4
Dependent Claim
24 words
A gas responsive device according to claim 1 wherein said voltage divider is a resistor and said tap is adjustably positioned on said resistor.
Claim 5
Dependent Claim
39 words
A gas responsive device according to claim 1 including a second relay having a coil and contacts, the last said coil being connected in series with said voltage divider and is energized by current flowing through said detecting element.
Claim 6
Dependent Claim
21 words
A gas responsive device according to claim 1 including a light emissive discharge lamp connected in parallel with said relay coil.
Claim 7
Dependent Claim
24 words
A gas responsive device according to claim 4 including a light emissive discharge lamp connected in parallel with the coil of said secondary relay.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |